Prachett's Reminder is a written note found in Dishonored.
The Crowded Street, first floor.
Transcript
Remember that the truth is in the paintings!
Anchored Whaling Ship, third floor.
The way to the truth starts in the crowded streets. Continue until you see an anchored whaling ship.
Whale Slaughterhouse, second floor.
From there, find the slaughterhouse and the truth will be revealed to you.
Location
It can be found in Pratchett's House during the the Royal Physician mission, on a table on the second floor.
Trivia
- The note is a riddle that reveals the combination to the safe in Prachett's apartment. The combination is composed of numbers shown in three different paintings within the residence.